A town where 30% of the population vanished in twenty years was home, half a century ago, to thirty-seven thousand people. Otsuki-shi’s numbers are not proof of decline but a record of what a place that once flourished now carries.
A mountain-valley city where post towns of the Koshu Kaido lined up and which flourished as a railway junction. From a peak of about 37,000 in 1970, the population fell over half a century to the 22,000 range. What I (Atlas) want to read here is not “so it’s no good,” but the causal thread: how the structures — terrain, the highway, the railway, industry — are translated into today’s land prices and the number of schools.
01 · Measuring where Otsuki-shi stands now, in numbers
In the most recent Population Census the population is about 22,000 (22,512 in 2020). Over the twenty years from 33,124 in 2000 it fell about 32%, and the share aged 65 and over rose from 22.2% (2000) to 40.4% (2020). Those under 15 shrank from 4,708 to 1,657, to nearly one third.
The published residential land price is around 58,000 yen per m², a low level for the outer ring of the Tokyo metropolitan area. The Fiscal Capacity Index is 0.6 (FY2023), a structure that cannot cover expenditure on its own tax revenue alone and depends on the local allocation tax. Seen in isolation these read as “cheap, small,” but why the figures are what they are cannot be read without going back to this town’s terrain and origins.
Source: Population Census (Statistics Bureau, MIC) / Real Estate Information Library (MLIT) / Local Government Finance Survey (MIC)
02 · From post town to railway town — the origins behind the numbers
In the Edo period Otsuki was a transport hub where post towns of the Koshu Kaido lined up. Of the highway’s post stations, 12 are said to have stood within the present municipal area, functioning as a relay point where people and goods flowed east and west. From the Meiji era the Chuo Main Line ran through, and the Fujikyuko Line heading toward Mount Fuji branches off at Otsuki. The post town of the highway passed its role straight on to a junction town of the railway. In the terms of economic geography, the “advantage of the node” was the foundation of this town’s prosperity.
Another backbone was its face as a producer of the silk textile called Gunnai-ori. Sericulture and weaving were among the few industries that could be established on the limited flatland of a mountain valley, and they supported local employment until a period after the war. But the contraction of the textile industry — and the way the Chuo Main Line and the Chuo Expressway brought the Tokyo area “close” — worked in reverse on a town built as a node. Commuting and shopping alike were drawn off toward the Tokyo side: the so-called straw effect. The geographic constraint that most of the municipal area is steep mountain, hard to develop into large housing or factory sites, spurred this on.
Source: Otsuki-shi (overview of history and geography) / Population Census (Statistics Bureau, MIC)
03 · For children to decline is for schools to decline
Population decline appears most plainly as a count of living infrastructure. The elementary schools in the city were consolidated from 15 in 2000 to 5 by 2023, and elementary pupils fell from 1,996 to 676. By the arithmetic, two of every three schools vanished over this quarter century.
The childcare waitlist is most recently zero, but this is less the result of meeting demand than of slack opening up against capacity as the absolute number of children fell. The figure of a zero waitlist should not be short-circuited into “ease of raising children”; it needs to be read as a set with the background that “the number of children itself is thinning.” Numbers are a mirror that reflects structure, not good or bad.
Source: School Basic Survey (MEXT) / Childcare Facility Status Report (Children and Families Agency)
04 · In prosperity it held people; in contraction it only lets them pass
Even so, Otsuki keeps its distinctive functions. Otsuki Station is the connecting station of the Chuo Main Line and the Fujikyuko Line, and people still pass through it as a transfer point toward the Fuji Five Lakes. The Chuo Expressway, the Chuo Main Line and National Route 20 (the Koshu Kaido) run east and west through the municipal area, and the Saruhashi bridge over the Katsura River, one of Japan’s three unusual bridges, is designated a place of scenic beauty. On Mount Iwadono rising to the north of the urban area remain the ruins of Iwadono Castle (a prefecturally designated historic site) from the Warring States period.
In tourism, however, there is an official self-assessment that rather than being a destination itself, Otsuki has become a “pass-through point” for people heading to Mount Fuji and the Fuji Five Lakes. The same quality of being a “transport hub” kept people in the town in its era of prosperity, and in its era of contraction merely lets them pass through. The location that once lodged travelers at this post town has now quietly turned its function inside out, into a place glanced past through a train window.
05 · Atlas note — carrying with twenty-two thousand the bones that supported thirty-seven thousand
Decline, aging, consolidation. Lay out Otsuki’s numbers and, at first glance, dark indicators follow one after another. But if I read the books with the eye of someone who has himself weighed commute against budget while searching for land to build a house, this can also be read as “a town where the infrastructure that once supported thirty-seven thousand — railway, highway, school sites, water and sewer — remains in a present of twenty-two thousand.” Stock does not decline as fast as population.
This town, which flourished as a node where post towns of the Koshu Kaido lined up and the Chuo Main Line and the Fujikyuko Line branch, was struck by the straw effect, in which the Tokyo area’s growing “closeness” drew commuting and shopping off toward the center. The geography in which most of the municipal area is steep mountain, hard to develop into large housing sites, spurred this on. The post-town location that once lodged travelers has turned its function inside out into a pass-through point glanced past through a train window. Even so, mountains, a river and low land prices remain at a distance reachable from the center on a single Chuo Main Line train. To carry the bones of thirty-seven thousand with twenty-two thousand — you can call this surplus a margin to draw on, or you can call it a burden too heavy to maintain. I (Atlas) stop my hand at the point of setting both readings side by side. Which sign it closes on — there are as many answers as there are readers, each with a different commuting distance, a different household scale, a different familiarity with life in a mountain valley.
Source: Population Census (Statistics Bureau, MIC) / City of Otsuki (history and statistics) / Otsuki-shi (overview of history and geography)
Editor’s note: all figures and sources are drawn from official statistics. The prose follows Atlas’s voice, and AI (atlas-handcrafted-reverse-v1 (Daiki 2026-05-29)) handled the shaping of the text. Evaluative or predictive language (such as “a good buy” or “attractive”) is intentionally left out. Revision id: otsuki_7